Metal deforming – By shot-blasting
Reexamination Certificate
2008-06-06
2009-08-04
Jones, David B (Department: 3725)
Metal deforming
By shot-blasting
C029S090700, C451S038000
Reexamination Certificate
active
07568368
ABSTRACT:
A method for the surface treatment of ferritic/martensitic 9-12% Cr steels for the purpose of achieving an improved oxidation behavior and increased resistance to solid particle erosion at application temperatures of above 500° C., in particular around 650° C., in steam includes, in a first step, a known shot peening of the surface of the steel with steel particles, and, subsequently, in a second step, shot peening with glass particles, optionally, in a following third step, the surface of the steel being smoothed. A subsequent additional heat treatment is unnecessary.
REFERENCES:
patent: 4426867 (1984-01-01), Neal et al.
patent: 4428213 (1984-01-01), Neal et al.
patent: 5057108 (1991-10-01), Shetty et al.
patent: 5113681 (1992-05-01), Guesnon et al.
patent: 5733392 (1998-03-01), Usher
patent: 19517275 (1996-11-01), None
patent: 69225065 (1998-11-01), None
Aguero, A., et al., “Steam Oxidation of Slurry Aluminide Coatings on Ferritic Steels for Advanced Coal-Fired Steam Power Plants,” Mat. Sci. For. 2004, vols. 461-464, pp. 957-964m Trans Tech Publications, Switzerland.
Haruyama, H., et al., “Effect of shot peening and pre-oxidation treatment in air on steam oxidation resistance of Mod.9Cr-1Mo steel,” EPRI 2004, National Institute for Materials Science, pp. 659-667, Japan.
Caplan, D., “Effect of Cold Work on the Oxidation of Fe—Cr Alloys in Water Vapour at 600oC,” Corrosion Science 1966, vol. 6, pp. 509-515, Pergamon Press Ltd., Great Britain.
Minami, Y., et al., “Steam-Oxidation Resistance of Shot Blasted Stainless Steel Tubing After 10-Year Service,” NKK Tech. Rev. 1996, vol. 75, pp. 1-10, JFE Steel Corp., Japan.
Search Report for German Patent App. No. 10 2007 028 276.3 (Oct. 5, 2007).
Knoedler Reinhard
Scarlin Richard Brendon
Straub Stefan
ALSTOM Technology Ltd.
Cermak Adam J.
Cermak Kenealy Vaidya & Nakajima LLP
Jones David B
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